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HVAC Drive H300 87
Issue Number: 3
Figure 4-18 Location of the 24 Vdc power supply connection on size 8 to 11
4.6 Low voltage operation
With the addition of a 24 Vdc power supply to supply the control circuits, the drive is able to operate from a low voltage DC supply with a range from
24 Vdc to the maximum DC volts. It is possible for the drive to go from operating on a normal line power supply voltage to operating on a much lower
supply voltage without interruption.
Going from low voltage operation to normal mains operation requires the inrush current to be controlled. This may be provided externally. If not, the
drive supply can be interrupted to utilise the normal soft starting method in the drive.
To fully exploit the new low voltage mode of operation, the under voltage level is now user programmable. For application data, contact the supplier of
the drive.
The working voltage range of the low voltage DC power supply is as follows:
Size 3 to 11
Minimum continuous operating voltage: 26 V
Minimum start up voltage: 32 V
Maximum over voltage trip threshold: 230 V drives: 415 V
400 V drives: 830 V
575 V drives: 990 V
690 V drives: 1190 V
Size 9E, 10E and 11E drives do not have an accessible negative DC terminal. It is recommended that 9D, 10D and 11D drives are used as an
alternative when this is needed, please refer to the Modular Installation Guide for further details.
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